Vibrator screen support



N A M s A H l VIBRATOH SCREEN SUPPORT Filed Nov. .25, 1938 i lNvENToRJAMES HASMAN ,#f; f W07 ATTORNEYS Patented Dec. 19, 1939 VBRATOR SCREENSUPPORT Application November 25, 1938, Serial No. 242,225

3 Claims.

This invention relates to improvements in vibrator screen supports andmore particularly to means for holding a screen under evenly distributedand steadily maintained tension.

As is well known, vibrator screens do their best work when maintainedunder spring tension and when all portions of the screen are as near aspossible under even tension.

An object of the present invention is to provide l novel means formaintaining an evenly distributed pull on the vibrator screen andresilient means for insuring tension on the screen at all times.

Another object of the present invention is to provide a novelcombination of skirt boards or balde plates adapted to guide materialonto and retain material on the screen, such boards or plates being ciresilient metal engaging the screen so as to hold it under tension.

Other objects and advantages of the inven- 20 tion including novelformation and arrangement of the parts composing the structure will beapparent from the accompanying drawing and spccication and the essentialfeatures thereof will. be set forth in the claims.

25 In the drawing, Fig. l is a plan view partly broken away showing myinvention as supplied to one form of vibrator screen; while Fig. 2 is anenlarged detail section taken along the line 2-2 of Fig. l.

30 In the drawing, lil refers generally to a comparatively rigid framewhich serves to support the screen i l. The frame lli may be of anysuitable forno, the one shown being made up of structural shapes, itonly being necessary for the 35 purpose of the present invention thatthere be side members ida` of the frame lying along opposite side edgesof the screen so as to apply a stretching force to the screen. Thescreen Il is often of a very fine mesh which is difficult to .t0 stretchevenly and tightly and therefore for the purposes of the presentinvention I have shown metal strips l2 substantially coextensive withoppositie side edges of the screen ll and clampingly secured` thereto inany suitable manner as for 45 instance by rivets or bolts. Both sides ofthe screen are alike and so only one is shown in Fig. 2, it beingunderstood that the other side has similar parts.

Means is provided for exerting an evenly dis- 50 tributed pull to thestrips l2 and in the present instance this comprises a pipe i3 extendingalong the entire side of the screen and slotted, as at its so that thescreen with the clamping strips attached may be inserted and removedlength- 65 wise of the pipe la. It win be noted that the 1nteriordiameter of the pipe is adapted to accommodate the strips l2 and whenpull is exerted on the pipe the edges thereof adjacent the slot give anevenly distributed pull along the entire length of the strips i2. For sopulling on the pipe i3 5 to stretch the screen, at various points alongthe length of the pipe are rigidly secured thereto the bolts i4 as bywelding at point ida.. These bolts extend upwardly and outwardly throughsuitable apertures in the frame members ida and nuts l5 10 pullingagainst suitably arranged shoulders I6 apply a stretching eiTect to thescreen. The bolts i4 are spaced along the side of the screen at sufcientintervals to exert an evenly distributed pull.

Means is provided to hold the screen under resilient tension when it isstretched by pulling upon the bolts Hl. This means comprises resilientmetal strips l rigidly secured along their upper edges to the frame asat lla by welding or otherwise and having their lower edges at theportion lib engaging the screen. Since the strips Il are coextensivewith the opposite side edges of the screen they exert their resilienttensioning efect at all points along each side of the screen. Forcheapness of construction and to engage the screen with the minimum ofwear the portion l'lb may be constructed substantially of a circularsection such as a cut-out portion of pipe, if desired. As illustrated inthe drawings, the strips or plates il are so constructed and position asto form uninterrupted surfaces extending upwardly and outwardly from thescreen engaging portions i'lb` so that the plates ll form skirt boardsor baffles directing material onto the screen and holding material fromlateral movement ci the screen.

It will be obvious from an inspection of Fig. 2 that the pull on theopposite side edges of the screen where the pipe I3 engages the clamping40 strips i2 pulls upwardly against the resilient plates ll so thatthese plates in effect form leaf springs to hold the screen under aresilient tension.

Since all of the parts shown here move together as the screen isvibrated. there is no relative friction between them.

What I claim is:

l. A vibrator screen support comprising a screen within a frame,resilient metal strips supported by said frame, one strip along each ofopposite side edges of said screen, each strip engaging said screen fromend to end and inwardly from the side edges of said screen, and meansfor exerting an evenly distributed lateral pull along the side edges ofsaid screen in a direction to pull said screen against said strips.

2. A vibrator screen supportl as in claim 1 wherein said resilient metalstrips are uninterrupted baffles sloping upwardly and outwardly fromtheir screen engaging portions so as to form skirt boards.

3. A vibrator screen support comprising a screen, a frame havingportions lying outside opposite side edges of said screen, clampingstrips extending continuously along opposite side edges of said screen,tubular members longitudinally slotted and coextensive with said stripsand embracing said strips with said screen extending

